关键词： Pulse-height discriminator   action potentials   computer interface  

关键词： Laboratories   Neurophysiology   Neurons   Nervous system   Stochastic processes   Microcomputers   Biology computing   Data processing   Nerve fibers   Frequency domain analysis  

ISBN: (纸本)None

摘要： The conceptualization of the ongoing neuroelectric activity as a stochastic time series has provided a framework for the utilization of the small computer in the laboratory. Laboratory computers provide extensive computational, filing, and control capabilities which are being incorporated into the routine investigation of neurophysiological phenomena. The computational procedures implemented include both time and frequency domain techniques. Equipment utilized includes special-purpose digital computers, general-purpose minicomputers, and minicomputers with graphics capability used as intelligent terminals to larger machines.

关键词： Mathematical and Computational Biology   Life Sciences   general   Cell Biology  

关键词： Frequency variation   Diagnosis   Integrate   Wakefulness   Electroencephalography   Adrenergic alpha-Antagonists   DEPENDENCE  

摘要： Integrated measures of electroencephalogram (EEG) amplitude and its variability over time, and of mean alpha frequency, have been applied to study the responses of six schizophrenic and six nonpsychotic volunteers to 45-minute periods of perceptual deprivation (PD), as compared to a prior condition of resting, eyes-closed but perceptually structured state. Interpreting results in relation to the concept that the integrated EEG measures reflect cortical activation states, field dependency and diagnostic grouping are found to interact to a statistically significant degree in their effect on the integrated EEG measures. Alpha frequency changes do not relate to diagnosis but only to field dependency status, suggesting that field-dependent subjects become more generally aroused under PD as compared to pre-PD, while field-independent subjects tend to become less aroused. The alpha frequency changes do not correlate with changes in the integrated EEG measures. The various EEG changes are discussed in relation to possible systems of general arousal and of selective cortical inhibition, and to clinical observations of schizophrenics' "paradoxical" response to perceptual or sensory isolation.(C) Williams & Wilkins 1971. All Rights Reserved.

关键词： Current Activity  

摘要： This article reviews results on a learning theory that can be derived from simple psychological postulates and given a suggestive neurophysiological, anatomical, and biochemical interpretation. The neural networks described can discriminate, learn, simultaneously remember, and perform individually upon demand any number of space-time patterns of essentially arbitrary complexity. A general theorem expressing this fact is stated in the language of nonlinear functional-differential systems. Applications of the theory to various empirical problems are mentioned; e.g., serial learning, stimulus sampling, lateral inhibition, energy–entropy dependence, reaction time, transmitter production and release, spatiotemporal masking, operant and respondant conditioning, influences of under- or over-arousal on learning. © 1971 Taylor & Francis Group, LLC.

摘要： The solution of a partial differential equation obtained by Lorente de No in his recent studies on the longitudinal polarization of the core of nerve fibers is presented. In particular, for the limiting steady state and in the absence of longitudinal polarization, both the equation and his solution reduce to known expressions. © 1970.